His voice here (especially in the pre-chorus and chorus) sounds like it has a little struggle in it, or maybe that's intentional?
Keep in mind, with all the production work that is done in the studio and all the technology that is available, it is very unlikely that Scott's voice would unintentionally sound like it "has a little struggle in it." I would certainly think that they would do other takes and do some clean-up work in the studio to get it sounding how they want it to sound.
I can agree with that, but also, if a certain take conveys a certain feel (or desperation for example), you might want to keep it...i'm not saying this is the case...but a song that comes to mind (if anyone is familiar with it) is "In A Little While" off of U2's All That You Can't Leave Behind. It sounds as if Bono is singing with a cold or like his voice was a little blown out or something...but again, i think it's cool.